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pause_linux.go
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pause_linux.go
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// +build linux
// Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file is distributed
// on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied. See the License for the specific language governing
// permissions and limitations under the License.
package pause
import (
"context"
"fmt"
"github.com/aws/amazon-ecs-agent/agent/acs/update_handler/os"
"github.com/aws/amazon-ecs-agent/agent/config"
"github.com/aws/amazon-ecs-agent/agent/dockerclient"
"github.com/aws/amazon-ecs-agent/agent/dockerclient/dockerapi"
log "github.com/cihub/seelog"
"github.com/docker/docker/api/types"
"github.com/pkg/errors"
)
// LoadImage helps load the pause container image for the agent
func (*loader) LoadImage(ctx context.Context, cfg *config.Config, dockerClient dockerapi.DockerClient) (*types.ImageInspect, error) {
log.Debugf("Loading pause container tarball: %s", cfg.PauseContainerTarballPath)
if err := loadFromFile(ctx, cfg.PauseContainerTarballPath, dockerClient, os.Default); err != nil {
return nil, err
}
return getPauseContainerImage(
config.DefaultPauseContainerImageName, config.DefaultPauseContainerTag, dockerClient)
}
func loadFromFile(ctx context.Context, path string, dockerClient dockerapi.DockerClient, fs os.FileSystem) error {
pauseContainerReader, err := fs.Open(path)
if err != nil {
if err.Error() == noSuchFile {
return NewNoSuchFileError(errors.Wrapf(err,
"pause container load: failed to read pause container image: %s", path))
}
return errors.Wrapf(err,
"pause container load: failed to read pause container image: %s", path)
}
if err := dockerClient.LoadImage(ctx, pauseContainerReader, dockerclient.LoadImageTimeout); err != nil {
return errors.Wrapf(err,
"pause container load: failed to load pause container image: %s", path)
}
return nil
}
func getPauseContainerImage(name string, tag string, dockerClient dockerapi.DockerClient) (*types.ImageInspect, error) {
imageName := fmt.Sprintf("%s:%s", name, tag)
log.Debugf("Inspecting pause container image: %s", imageName)
image, err := dockerClient.InspectImage(imageName)
if err != nil {
return nil, errors.Wrapf(err,
"pause container load: failed to inspect image: %s", imageName)
}
return image, nil
}